I am as surprised as anyone at the high power level of the spells that require colorless mana. (I also think it needs a better name, such as "unaffiliated" or "transparent", or even just "uncolor" for short.) Anyway, my faith in this product has taken a turn upwards from this innovation - and it is absolutely an innovation. There are some interesting side effects that I think are good for Legacy specifically because they decided to go very strong on no color. I have listed them in order of increasing scope.

1. Karplusan Forest has a real actual advantage over Taiga. Gheizen64 has Scrublands and Marsh Flats in his versions for the BW Eldrazi deck. I think that these cards are not as good as simply Caves of Koilos.
2. Ancient Tomb, Wasteland, Blighted Fen, Cavern of Souls, etc are all exceptionally powerful as long as the colorless "color" continues to get support.
3. This entire enterprise has potentially huge consequences. All of the uncolor lands were created with the understanding that producing generic mana was a lesser thing than mana of a specific color. Compare Blasted Landscape and Drifting Meadow for a stark example. I actually can not find anything beyond the stuff you guys are already into with Cloudposts and City of Traitors and whatever. And I suppose they will not be printing powerful colorless lands in the future because of this. But there is the danger of printing powerful uncolor spells in the higher mana zones just with the lands we already have.
4. What does this mean for Legacy? I feel that the more uncolor spells they print, the better it is for us. It forces hard design decisions (Brainstorm decks basically can not use this stuff at all). It reduces the strain placed upon limited traditional land supplies on the Reserved List (duals suck). And it opens up entirely new spheres of decks (I haven't the vaguest guess what the strengths are of decks that have never existed before).

What do you think?